A certain reaction has ΔH∘=35.4kJ and ΔS∘=85.0J/K. You may want to reference (Pages 831 - 832) Section 19.6 while completing this problem. Part APart complete Is the reaction exothermic or endothermic? exothermic endothermic Previous Answers Correct A positive enthalpy value indicates that energy is absorbed by the system. Therefore, the reaction is endothermic. Part BPart complete Does the reaction lead to an increase or decrease in the disorder of the system? increase decrease Previous Answers Correct The sign of the entropy change is positive, which indicates that the disorder, or entropy, of the system has increased. Part C Calculate ΔG∘ for the reaction at 298 K.

The change in Gibb's free energy, ΔG° for the reaction at 298 K is; 10.070 kJ

Given; we have;

We can evaluate ΔG° by using the formula below;

in which case;

Therefore,

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ΔG° for the reaction at 298 K is 10.070 kJ

Explanation:

Here we have ΔH° = 35.4 kJ

ΔS° = 85.0 J/K

The formula for ΔG° for the reaction is given by the following relation;

ΔG°  = ΔH° - T×ΔS°

Where:

ΔH° = Change in enthalpy of the chemical reaction

ΔS° = Change in entropy of the system and

ΔG° = Change in Gibbs free energy

T  = Temperature of reaction = 298 K

Therefore, ΔG°  = 35.4 kJ - 298 K × 85.0 J/K = 35.4 kJ - 298 K × 85.0 J/K

= 35.4 kJ - 25330 J = 35.4 kJ - 25.330 kJ = 10.070 kJ

Therefore, ΔG° for the reaction at 298 K = 10.070 kJ.

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".